- Yaw axis
Yaw axis is a vertical axis through an
aircraft, rocket, or similar body, about which the body yaws; it may be a body, wind, or stability axis. Also known as yawing axis. [cite web|url=http://www.websters-online-dictionary.org/ya/yaw+axis.html|title=Specialty Definition: YAW AXIS|accessdate=2008-07-31]
The yaw axis is defined to be
perpendicularto the body of the wings with its origin at the center of gravity and directed towards the bottom of the aircraft. A yaw motionis a movement of the nose of the aircraft from side to side. The pitch axis is perpendicular to the yaw axisand is parallel to the body of the wings with its origin at the center of gravityand directed towards the right wing tip. A pitch motion is an up or down movement of the nose of the aircraft. The roll axis is perpendicular to the other two axes with its origin at the center of gravity, and is directed towards the nose of the aircraft. A rolling motion is an up and down movement of the wing tips of the aircraft. cite web|url=http://www.answers.com/topic/yaw-axis|title=Yaw axis|accessdate=2008-07-31]
In flight, the control surfaces of an aircraft produce
aerodynamicforces. These forces are applied at the center of pressure of the control surfaces which are some distance from the aircraft cg and produce torques (or moments) about the principal axes. The torques cause the aircraft to rotate. The elevators produce a pitching moment, the rudder produces a yawing moment, and the ailerons produce a rolling moment. The ability to vary the amount of the forceand the momentallows the pilot to maneuver or to trim the aircraft.
The first aircraft to demonstrate active control about all three axes was the
Wright brothers' 1902 glider [cite web|url=http://www.grc.nasa.gov/WWW/K-12/airplane/rotations.html|title=Aircraft rotations|accessdate=2008-08-04] .
Flight control surfaces
* [http://oai.dtic.mil/oai/oai?verb=getRecord&metadataPrefix=html&identifier=AD0749489 Yaw Axis Control as a Means of Improving V/STOL Aircraft Performance.]
* [http://ieeexplore.ieee.org/Xplore/login.jsp?url=/iel5/9091/28850/01297903.pdf?temp=x 3D fast walking simulation of biped robot by yaw axis moment compensation]
* [http://www.patentstorm.us/patents/6478262/claims.html Flight control system for a hybrid aircraft in the yaw axis]
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